Eraser.



W. ROBERTS,

ERASER APPLICATION FILED AUG-24. I914 Patented Oct. 1-6, 1917.

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l zdy ufl WITNESSES:

Ul lTTEU STATg PATENT @FFTQEO WELDON ROBERTS, OF MONTCLAIR, NEW JERSEY.

ERASER.

Application filed August 24, 1914.

To all UZIOHI it mar concern:

Be it known that I, VfELnoN ROBERTS, a citizen of the United States, and a resident of Bilontclair, in the county of Essex and State of New Jersey, have invented certain Improvements in Erasers, of which the following is a specification.

T he objects of this invention are to pro vide an eraser for draftsman, typewriters and the like, which shall combine the properties of both a pencil eraser and an ink eraser; to enable either pencil eraser or ink eraser to be used practically alone or the two used simultaneously in combination of any proportion between the whole of one and none of the other or none of the first and the whole of the second; to enable the combination of pencil and ink eraser to be made and adjusted instinctively or intuitively in use; to thus secure an eraser which i adapted to various uses required of it, and to secure better erasing with less detrimentto the paper: to secure such an eraser, which (litters greatly in form or appearance from erasers now on the market, and to obtain other ac vantages and results as may be brought out in the following description.

Referring to the accompanying drawings in which like numerals of reference indicate the same parts throughout the several views,

Figure l is a side View of an eraser embodying my improved construction in its preferred form,

Fig. 2 is a sectional view of the same;

Fig. 3 is a side view of a modified form of my invention, and

Fig. lis a section thereof.

In the specific embodiment of the invention shown in said drawings, and referring particularly to Figs. 1 and 2, reference numeral 1 indicates the disk-like body of my improved eraser, having at opposite sides thereof plates 2. 3 secured together by an eyelet at extending therebetween and passing through the body 1, all as is usual in the well-known type of eraser which is commonly called circular eraser.

The body or disk 1 of the eraser comprises a median layer 5 of pencil eraser and on opposite sides of said median layer 5 are outside layers 6, 6 of ink eraser, all said layers being formed of any material known to the art such as rubber treated in the usual way to make pencil and ink erasers. The marginal portion of the eraser which projects beyond the side plates 2, 3 there Specification of Letters Patent.

Patented Got. 16, 1917.

Serial No. 858,280.

fore presents at its sides ink erasive ma terial while at the extreme edge the pencil erasive material is exposed.

In using the eraser, the eiiect of practically all ink eraser may be secured by, tipping the eraser fiatwise almost onto either of its sides, while the effect of practically entire pencil eraser may be secured by standing the eraser upright on edge. Obviously by tipping it at a greater or less angle into position intermediate those just stated, the combined effect of ink eraser and pencil eraser may be obtained in any desired proportion. The eraser can thus be adapted to any kind of work which presents itself, and do such work effectively without injuring the paper. F or instance, if a typewritten letter to be removed is very black the pencil eraser can first be employed to prevent smearing, and then the ink eraser used to remove the letter changing gradually back to the pencil eraser for smoothing and polishing.

In Figs. 3 and 4, 7 indicates the body portion of an eraser comprising a middle layer i. of ink erasive material and outside layers 9, i) of pencil erasive material, the middle layer of ink erasive material being thick enough so that a suflicient surface of it is presented at the periphery of the eraser. Obviously the use of this eraser would be the same the preferred form already described, except that it would be tipped on its side for pencil erasing and stood upright on edge for ink erasing. The preferred form is considered better, however, because the softer ink eraser usually wears away faster than the middle layer of tougher pencil erasive material and so the latter maintains an edge on the eraser such as is particularly desirable in typewriter work.

The layers of my improved eraser may be secured together in any suitable manner known to those skilled in the art, as by vulcanizing, and while I have shown the eraser in the form of a circular eraser, obviously it might be otherwise made up. The side plates 2, 3 of the circular eraser serve nicely, however, to insure that the eraser is used at and adjacent to its edge, so that the layers are worn back somewhat evenly.

In any event, the outer layers are exposed at their edges and outer marginal portions, while the middle layer is exposed only as said outer layers are worn away, The thickness and material of the layers, that is of the outer layers with respect to the middle layer, can be made to serve the particular purpose desired it being understood that the proportion is always such that the outer layers will Wear away fast enough to expose the middle layer as desired. This always retains a sharp or tapered edge of the eraser and eonduces to its most eiiieient use as set forth.

Having thus described the invention What I claim is:

1. An eraser comprising a middle layer .of erasive material and opposite outside layers of erasive material difierent from that of said middle layer, all said layers being firmly united to sustain one another and the outer layers being so proportioned with respect to the middle layer as that said outer layers Will be worn away at their edges and outer marginal portions by use faster than the Copies of this patent may be obtained for five cents each, by addressing the Gommissioner 0i Eatents,

middle layer to expose the middle layer as required and always retain atapered or saarpened edge on the eraser.

2. An eraser comprising a middle layer of erasive material and opposite outside layers oferasive material different from that of said middle layer but alike in both of themselves, all said layers being firmly united to sustain one another and the outer layers being so proportioned with respect to the middle layer as that said outer layers will be worn away at their edges and outer marginal portions by use faster than the middle layer to expose the middle layer as required and always retain a tapered or sharpened edge on the eraser.

*WELDON' ROBERTS.

Witnesses HOWARD P. KING, MILDRED E. Broons.

Washington, I). 1, 

